appreciate your budget does restrict options. Well done for getting a race seat unit and making it fit!
I recall a few weeks ago a US guy was offering an airtech MC21 seat unit (original shape) for a pretty low price (100 bucks or something). Worth checking back in the Classifieds Section?
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30